

Ukraine isn’t a member of NATO. If it was, do you honestly think Europe wouldn’t have gotten directly involved by now? They’ve already declared their unconditional support, and have donated billions of dollars worth of military hardware to their defense. The commitment is there.
Canada on the other hand, is a founding member of NATO. And Greenland is the sovereign territory of another. If the US attacks either one of them, it will trigger article 5 of the charter. The rest of NATO will have no choice but to respond, or leave the alliance…which would immediately open them up to attack from Russia. And they would be forced to defend themselves alone. There is no way any of them would be that stupid. Not with Russia on one side, and the US on the other. It would be suicide.
It’s only a piece of paper with words in it, if no one is willing to stand up and defend it. We the People can enforce it.